This appears to be a problem with some display modes on graphics cards, and DirectX drivers for the card may either fix or exacerbate the problem. Two possible workarounds are available:

Ø Try turning off the hardware accelerator on your graphics card and see if it makes a difference. To turn off hardware acceleration, go into the Control Panel, start System, click the Performance tab, then click on "Graphics...". Move your Hardware Acceleration slider all the way to the left (None). You may have to reboot after this.

Ø Try using a different color mode (i.e. use 16 million colors, or 65535 colors, if your currently using 256 colors). Sometimes a bug in the driver isn't in all display modes but only one.

The solution to both of these problems is to obtain newer drivers for your graphics card, or to operate the card in a different non-buggy mode. Try visiting your graphic card manufacturer's site to see if any newer device drivers exist.